To cite package ‘geess’ in publications use:

  Ishii R (2026). _geess: Modified Generalized Estimating Equations for
  Small-Sample Data_. R package version 1.0.1,
  <https://github.com/rtishii/geess>.

A BibTeX entry for LaTeX users is

  @Manual{,
    title = {geess: Modified Generalized Estimating Equations for Small-Sample Data},
    author = {Ryota Ishii},
    year = {2026},
    note = {R package version 1.0.1},
    url = {https://github.com/rtishii/geess},
  }